How should a pilot communicate using the speechless technique?

The speechless technique is employed in aviation communication primarily for communication that doesn’t involve verbal contact, typically in situations where a pilot may need to send a message without broadcasting it verbally.

Using three clicks to say "again" is indicative of a request for repetition or clarification of a message. This technique signifies to air traffic control or other aircraft that the pilot has received a transmission but did not completely understand or is unable to acknowledge it appropriately. The structure of using three clicks in this context aligns with established protocols for non-verbal communication, which ensures clarity and minimizes the risk of miscommunication in flight operations.

In contrast, using one or two clicks would not provide the same level of clarity or convey the message that additional information is required. The option involving four clicks at a nominated position is less relevant in the context of requesting a repeat, as it does not conform to standard conventions for indicating misunderstandings in transmissions. Thus, tapping into the appropriate number of clicks is essential for effective communication in aviation, emphasizing the necessity to communicate clearly while maintaining safety in operations.